Baseballs! Here are some neat vector baseball icons/logos I made. I used Adobe Illustrator to make all of these. The ball features a rubber or cork center, wrapped in yarn and covered in leather. It is 9 to 9 1⁄4 inches (229–235 mm) in circumfrence(2 7⁄8–3 in or 73–76 mm in diameter). The yarn or string used to wrap the baseball can be up to one mile (1.6 km) in length. Some are wrapped in a plastic like covering.